Average (Mean) Calculator
Calculate mean, median, mode, range, and standard deviation from any list of numbers. Also supports weighted averages.
Mean, Median, Mode Explained
Which Average Should You Use?
Mean is best for symmetric, normally distributed data. Median is more robust when there are outliers (e.g., income data where a few very high earners skew the average). Mode is useful for categorical data.
When Mean Misleads
If 9 people earn £20,000 and 1 person earns £200,000, the mean income is £38,000 — far above what most people earn. The median (£20,000) tells the real story. This is why median household income is more useful than mean.
Standard Deviation
Standard deviation measures how spread out values are around the mean. A low SD means values are clustered closely. A high SD means data is widely spread. Essential for understanding variability in any data set.
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